if place chief tell us us tonight he found the money and he will announce the benefactor tomorrow. >> i'm not worried because i know the folks will show up next saturday. >> reporter: many sellers say the slaughter of school children in connecticut touched raw nerves. ingly don't have to have the guns anymore. i would like a different world. >> reporter: the money ran out in oakland, too, but the program donor stepped in. keith stevenson gave another $50,000 to keep it going. san francisco police say this last weekend's buy back program was one of the more successful ones. so successful, the community groups that organized it are already working on a statewide buy back program. they are finding the sponsors now. live in san francisco, linda yee, cbs5. >>> and coming up, a bay area mom says her son had his mouth taped shut and his teacher did it. how she explains the extreme punishment. >>> are you getting overcharged at the check out line? the big grocery chain found to make more mistakes than tore stores. >> plus, what you can do with half a billion dollars. mark zuckerberg's gift to